CN107060144A - A kind of light steel wood mixing keel combined wall and its implementation - Google Patents

Abstract

The invention discloses a light steel-wood mixed keel composite wall and an implementation method thereof. The composite wall includes split cold-formed thin-walled steel, cork boards, self-tapping screws and light boards; the cold The bent thin-walled section steel includes two parts divided along the neutral axis of the cold-formed thin-walled curling channel steel web to form the steel keel in the mixed keel, and the two parts are respectively placed at the two ends in the height direction of the wall section; The cork board consists of two pieces, which form the wooden keel in the mixed keel, and are placed near the center and shaft of the cold-formed thin-walled steel; the cork board and the cold-formed thin-walled steel are connected by self-tapping screws to form a Overall; the light board is hung on the flanges of the cold-formed thin-walled steel on both sides of the mixed keel. The composite wall of the present invention has the characteristics of good thermal insulation performance, high bearing capacity, light weight, energy saving and environmental protection. In addition, when the keel does not meet the building thermal insulation requirements or mechanical performance requirements, it can continue to be used after replacing the corresponding parts, which greatly improves the flexibility. high.

Description

A light steel-wood mixed keel composite wall and its implementation method

technical field

The invention relates to the heat transfer performance and mechanical properties of a composite wall in the field of civil engineering, and specifically refers to a composite wall made of a light steel-wood hybrid structure as a keel and covered with an energy-saving and environmentally friendly light board, and belongs to the technical field of building construction.

Background technique

In China, traditional residential buildings have problems such as waste of land resources, high energy consumption, serious ecological damage, and poor comfort. In order to change the construction method of traditional houses, the country vigorously develops steel structures. With the continuous influx of foreign light steel structure enterprises and corresponding products and technologies, the cold-formed thin-walled steel structure system has developed rapidly.

Cold-formed thin-walled steel structure houses are mainly composed of walls, floors, roofs and maintenance structures. The wall of the cold-formed thin-walled steel structure residence is a light steel keel composite wall composed of light steel keel, inner and outer wall panels and sandwich layer materials. This kind of wall has the advantages of light weight and high degree of construction assembly. However, due to the existence of the steel keel, the local heat loss is significantly increased, resulting in condensation on the inner surface of the wall and condensation inside the wall, forming a serious thermal bridge effect at the steel keel, and it is even difficult to meet the building insulation requirements in cold regions.

In order to improve the thermal bridge effect of the light steel keel, the traditional method is to open slender holes on the web of the keel to increase the path of heat transfer. This kind of keel is called thermal insulation keel. When thermal insulation keels are used for load-bearing walls, the number of opening rows is limited in order to ensure the vertical bearing capacity of the walls. Increasing the number of opening rows will reduce the mechanical properties of the light steel keel. Although it can meet the building insulation requirements in cold regions, it can only be used for non-load-bearing walls and cannot take advantage of the high strength and good ductility of light steel members. The economic benefit of this body of wall declines.

In order to obtain a lightweight composite wall that has good thermal insulation performance, can withstand vertical loads and horizontal loads, and meets the requirements of "green buildings and building energy conservation", wooden keels of a certain length are arranged on both sides of the neutral axis of the steel keel to form Steel-wood hybrid keel, the new keel can give full play to the advantages of high steel strength and low thermal conductivity of wood. At the same time, the wooden keel also has a certain strength and rigidity, which can assist the steel keel to bear vertical loads and horizontal loads. While improving the thermal insulation performance of the lightweight composite wall, it ensures the load-bearing capacity of the wall. The cladding wallboards on both sides of the keel are made of composite materials composed of gypsum, cork particles and vermiculite, which can reduce or even avoid the diffuse cracks and shrinkage cracks when the wallboards are under pressure and the temperature changes.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a light steel-wood mixed keel composite wall with light weight, high bearing capacity and good thermal insulation performance, which can meet the requirements of "green building and building energy saving".

The technical solution adopted by the present invention to solve its technical problems is:

A light steel-wood mixed keel composite wall is characterized in that it includes split cold-formed thin-walled steel, cork boards, self-tapping screws and lightweight plates; the cold-formed thin-walled steel includes cold-formed thin-walled The two parts divided by the channel steel web and the axis of the wall curling form the steel keel in the mixed keel, and the two parts are respectively placed at the two ends in the height direction of the wall body section; The wooden keel in the mixed keel is placed near the center and axis of the cold-formed thin-walled steel web; the cork board and the cold-formed thin-walled steel are connected as a whole with self-tapping screws; the light-weight board is hung on On the flanges of the cold-formed thin-walled section steel on both sides of the mixed keel.

The overlapping length of the cork board and the cold-formed thin-walled section steel on each side is 15-20 mm.

The cold-formed thin-walled edged channel steel adopts Q235 steel or Q345 steel.

The self-tapping screw consists of three parts: a drill bit, a screw tap and a screw thread.

The cork board is a _Vc grade light wood board.

The lightweight board is a composite material synthesized from gypsum, cork particles and vermiculite.

The lightweight board is a composite material synthesized from gypsum, cork particles and vermiculite at a ratio of 1:0.08:0.3.

A method for implementing a light steel-wood mixed keel composite wall, comprising:

Step 1, determine the section size of the cold-formed thin-walled section steel and the spacing along the section height direction according to the load level of the vertical load and the horizontal load borne by the wall;

Step 2, add the distance between the cold-formed thin-walled section steel along the height direction of the section and the overlap distance of 15-20mm at both ends to determine the section height of the cork board;

Step 3, adjust the height of the cork section determined in step 2 according to the building insulation requirements of the wall, and determine the thickness of the cork board accordingly;

Step 4, according to the shear force of self-tapping screws, determine the type, spacing and quantity of self-tapping screws at the joint between cold-formed thin-walled steel and cork board;

Step 5, according to the temperature and humidity changes in the area where the wall is to be used and the stress of the outer cladding board, determine the ratio of the three materials: gypsum, cork particles and vermiculite;

Step 6. Hang the lightweight sheet on the flanges of the cold-formed thin-walled steel on both sides of the mixed keel.

The present invention has the following advantages and positive effects:

1. Good thermal insulation performance. The thermal conductivity of wood is a few tenths of that of steel. Setting a length of wooden keel in the steel keel can effectively reduce the heat loss at the keel and slow down the thermal bridge effect at the keel. This composite composed of steel-wood keel The wall can meet the building insulation requirements in cold regions of our country.

2. High carrying capacity. The steel keel is placed at both ends of the height direction of the wall section, whether it is under vertical load or horizontal load, the steel keel can be used to the greatest extent, and the mechanical characteristics of high strength of the steel are fully utilized. In addition, compared with the traditional steel keel, with the same amount of steel, the distance between the resultant force point of the steel keel at the upper end of the section and the resultant force point of the steel keel at the lower end of the section increases, and the bending bearing capacity of the section improve. At the same time, considering that the wood also has a certain strength, the wooden keel can assist in bearing the force. The bearing capacity of this kind of steel-wood hybrid keel is greatly improved compared with the traditional keel.

(3) Light weight. The density of wood is a few tenths of that of steel, and the wall composed of steel-wood mixed keels is light in weight, small in earthquake action, and good in earthquake resistance.

(4) Energy saving and environmental protection. Timber resources are easy to regenerate and are environmentally friendly. The invention adopts wood in the keel, and the cork particles in the outer cladding wallboard are by-products in the construction process of wooden components, thereby further reducing energy consumption.

(5) On-site construction is convenient, and parts are easy to replace. All parts of the composite wall can be processed and manufactured in the factory, and only need to be installed on site, and the construction speed is fast. When the keel does not meet the building insulation requirements or mechanical performance requirements, it can continue to be used after replacing the corresponding parts, with high flexibility.

The present invention will be further described in detail below with reference to the accompanying drawings and examples, but the light steel-wood mixed keel composite wall and its implementation method of the present invention are not limited to the examples.

Description of drawings

Fig. 1 is the sectional view of steel-wood mixed keel composite wall;

Fig. 2 is the front elevation view of steel-wood hybrid keel composite wall;

Fig. 3 is the left elevation view of steel-wood mixed keel composite wall;

Fig. 4 is the right elevation view of the steel-wood mixed keel composite wall.

Reference signs: 1. Cold-formed thin-walled section steel, 2. Cork board, 3. Self-tapping screw, 4. Light board.

detailed description

As shown in Figures 1 to 4, it includes cold-formed thin-walled steel 1, cork board 2, self-tapping screws 3 and light board 4, and the light board 4 forms an outer cladding wallboard.

Further, the cold-formed thin-walled section steel 1 is a split hemmed channel steel, that is, the cold-formed thin-walled hemmed channel steel is divided into two parts along the neutral axis of the web, and placed in the steel-wood mixed section respectively. The upper and lower sides of the keel. The type of channel steel selected depends on the load level of the wall, and the steel is Q235 steel or Q345 steel. The keel in the outer wall is mainly subjected to bending under the action of horizontal load. Placing the split cold-formed thin-walled steel 1 on both sides of the mixed keel can maximize the flexural performance of the keel and maximize the strength of the steel. high feature.

Further, there are two cork boards 2 that make up the wooden keel, which are _Vc -level light wood boards, placed on both sides of the web of cold-formed thin-walled steel 1, and along the section height direction, the wooden keel boards are near the neutral axis. The length of the wooden keel plate is equal to the length of the steel keel composed of cold-formed thin-walled steel, and the two are connected by self-tapping screws 3 . The thermal conductivity of wood is several tenths of that of steel, so the wooden keel board is the main thermal resistance component. The thickness and section height of the wooden keel board are determined according to the thermal insulation requirements of the wall. In addition, the elastic modulus of cork is much smaller than that of steel, so the rigidity of the wooden keel is lower than that of the steel keel. Under the action of axial load, the two parts carry out reasonable internal force distribution according to their respective stiffness, thus avoiding the compression damage of the wooden keel. At the same time, taking into account the low density of wood, such a combination can further reduce the weight of the wall and take advantage of the light structure system. Therefore, this kind of steel-wood keel has the advantages of light weight, good thermal insulation performance, and high bearing capacity; by changing the combination of steel keel and wood keel, a variety of steel-wood keel forms can be obtained to adapt to Different wall insulation and bearing requirements; after several years of use, if the keel is partially damaged or no longer meets the building insulation requirements, it can continue to be used after replacing the corresponding components.

Further, the above-mentioned self-tapping screw 3 consists of three parts: a drill bit, a tap and a screw thread. Drills are mainly used to drill holes on connectors, taps are used to process threads on holes, and the main function of threads is to screw screws in. The function of the self-tapping screw is to connect the steel keel and the wooden keel tightly, so that different parts work together. Under the horizontal load, the keel is mainly subjected to bending, and the normal stress distribution on the keel section obeys the assumption of a plane section. At the interface of the steel keel and the wooden keel, there is a tendency of relative slippage due to the difference in normal stress, so that the screws are sheared. The type, spacing and quantity of self-tapping screws are determined according to the magnitude of the shear force.

Further, the above-mentioned lightweight board 4 is formed by mixing gypsum, cork particles and vermiculite according to a certain ratio. Adding an appropriate amount of cork particles to the gypsum can improve the ductility of the gypsum board and avoid cracks in the external cladding wallboard during unexpected stress; adding vermiculite can prevent the cladding wallboard from producing expansion and contraction cracks in the process of temperature changes and ensure the external wall board integrity.

A method for implementing a light steel-wood mixed keel composite wall, comprising:

Step 1, determine the section size of the cold-formed thin-walled section steel and the spacing along the section height direction according to the load level of the vertical load and the horizontal load borne by the wall;

Step 2, add the distance between the cold-formed thin-walled section steel along the height direction of the section and the overlap distance of 15-20mm at both ends to determine the section height of the cork board;

Step 3, adjust the height of the cork section determined in step 2 according to the building insulation requirements of the wall, and determine the thickness of the cork board accordingly;

Step 4, according to the shear force of self-tapping screws, determine the type, spacing and quantity of self-tapping screws at the joint between cold-formed thin-walled steel and cork board;

Step 5, according to the temperature and humidity changes in the area where the wall is to be used and the stress of the outer cladding board, determine the ratio of the three materials: gypsum, cork particles and vermiculite;

Step 6. Hang the lightweight sheet on the flanges of the cold-formed thin-walled steel on both sides of the mixed keel.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (8)

1. A light steel-wood mixed keel composite wall is characterized in that it comprises split cold-formed thin-walled section steel (1), cork board (2), self-tapping screws (3) and light board (4) ); the cold-formed thin-walled section steel (1) includes two parts divided along the neutral axis of the cold-formed thin-walled channel steel web and forms the steel keel in the mixed keel, and the two parts are respectively placed on the wall The two ends in the height direction of the section; the cork board (2) consists of two pieces, which form the wooden keel in the mixed keel, and are placed near the web center and axis of the cold-formed thin-walled steel (1); the cork board (2) Connect the cold-formed thin-walled section steel (1) with self-tapping screws (3) into a whole; on the flange. 2. The light steel-wood mixed keel composite wall according to claim 1, characterized in that, the overlapping length of the cork board (2) and the cold-formed thin-walled steel (1) on each side is 15 -20mm. 3. The light steel-wood mixed keel composite wall according to claim 1, characterized in that, the cold-formed thin-walled crimped channel steel is made of Q235 steel or Q345 steel. 4. The light steel-wood mixed keel composite wall according to claim 1, characterized in that the self-tapping screw (3) consists of three parts: a drill bit, a tap and a threaded button. 5. The light steel-wood mixed keel composite wall according to claim 1, characterized in that, the cork board (2) is a _Vc grade light wood board. 6. The light steel-wood mixed keel composite wall according to claim 1, characterized in that, the lightweight board is a composite material synthesized from gypsum, cork particles and vermiculite. 7. The light steel-wood mixed keel composite wall according to claim 6, wherein the lightweight board is a composite material synthesized by gypsum, cork particles and vermiculite in a ratio of 1:0.08:0.3. 8. A method for implementing a light steel-wood mixed keel composite wall, characterized in that it includes: Step 1, determine the section size of the cold-formed thin-walled section steel and the spacing along the section height direction according to the load level of the vertical load and the horizontal load borne by the wall; Step 2, add the distance between the cold-formed thin-walled section steel along the height direction of the section and the overlap distance of 15-20mm at both ends to determine the section height of the cork board; Step 3, adjust the height of the cork section determined in step 2 according to the building insulation requirements of the wall, and determine the thickness of the cork board accordingly; Step 4, according to the shear force of self-tapping screws, determine the type, spacing and quantity of self-tapping screws at the joint between cold-formed thin-walled steel and cork board; Step 5, according to the temperature and humidity changes in the area where the wall is to be used and the stress of the outer cladding board, determine the ratio of the three materials: gypsum, cork particles and vermiculite; Step 6. Hang the lightweight sheet on the flanges of the cold-formed thin-walled steel on both sides of the mixed keel.